Running On-Device AI in a React Native App: Real-Time Hazard Detection with CoreML

I've been building a field inspection app where the core differentiator is this: AI that works with zero internet. No cloud call, no latency, no "sorry, you're in a dead zone." The model runs on the device and that's the whole point. This post is about shipping real-time on-device inference in a React Native (Expo) app — what the stack looks like, what actually tripped me up, and what the numbers look like so far. The Setup Safety inspection tool for construction sites. Inspectors w...